LAAAAAAAAAAAASERS!
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Transcript of LAAAAAAAAAAAASERS!
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LAAAAAAAAAAAASERS!
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L.A.S.E.R. – Light Amplification!• LASER, acronym
for Light Amplification by Stimulated Emission of Radiation. Lasers are machines that amplify light… usually they amplifyinfrared or ultraviolet light.
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Light Amplifier!• Think of an AMPLIFIER for
your guitar, bass, or microphone; they AMPLIFY the sound and make it much louder and more POWERFUL! Lasers are like light amplifiers; they make the light more powerful and intense…. just like your guitar amp makes the SOUND much more powerful and loud.
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Difference between amp and laser…• A guitar amp will work
with a huge RANGE of notes, scales, tones, etc., kind of like how light has many different colours.
• LASERS use only ONE “note” or ‘colour’ and amplify it.
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These light rays are NOT parallel.
• Lasers work so well because they can concentrate a HUGE amount of energy into a narrow, focused beam of light… all going in ONE direction.
Rays of light.
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In a laser, all the rays are grouped together (parallel) and travelling in ONE direction!
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How are lasers used?• Lasers have been used
to drill holes in diamonds, to cut metal for tools, to make micro-computer parts (very small computer parts) and electronics…
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How are lasers used?• To cut fashion
patterns, to synthesize (make) new material, and to help with scientific research, communication, medicine, the military, and arts.
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Medical lasers• Lasers can be used to
slice/cut the skin like a knife for surgery or to help SEAL (close) a cut or wound. Medical lasers can cut and cauterize (burn) the skin VERY QUICKLY, without damaging the surrounding healthy tissues.
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Medical lasers• They can be used to
destroy CANCER cells, without hurting the normal healthy cells nearby!
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Laser Eye Surgery… video!• Lasers can be
used to re-shape the cornea and fix people’s eye-sight! Mr. Mitchell now has perfect 20/20 vision from this!
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Scar removal and skin treatment
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Military uses!
Laser Target-Designator
v
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The future of driving…• Some new cars use lasers
as SENSORS; the lasers REFLECT or REFRACT off other objects (like other cars, people, animals, etc.,) that could be dangerous, and then send a WARNING to the driver!! In the future, laser sensors and laser communication systems could help cars drive by themselves!!
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Concert: Tupac Shakur, April 25th, 2012. He died in 1993! Is it a zombie? A ghost?
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Home use…
Laser tag!
7-11!
Music!!
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How does a laser work? (Advanced video!!)
• Any questions?? Answer the questions!!